104 PROCEEDINGS OF THE NATIONAL MUSEUM vol. no 



larger teeth so that its cross-sectional outline is distorted. Frequently 

 it is displaced to the lingual side of the tooth row. 



Dental formulae: Based on the foregoing conclusions, the dental 

 formulae of the bats discussed in this paper may be written as follows : 



12-. 1. 1-34. 123 __ ,. ,. 

 = 38 Myohs 



= 36 Plecotus 



= 34 Euderma, Barbastella 



= 32 Histiotus, Laephotis 



= 30 Otonycteris, Nydophilus, Pharotis 



= 28 Antrozous 



12-. 1 



1—4. 123 



Supraspecific Nomenclature and Relationships 



History op Nomenclature 



SuPRAGENERic NOMENCLATURE: Several genera of the family 

 VespertUionidae have exceptionally large ears: Plecotus (including 

 Corynorhinus and Idionycteris, now regarded as subgenera), Euderma, 

 Histiotus, Laephotis, Otonycteris, Nyctophilus, Pharotis, and Antrozous. 

 The relationships of these genera have been variously interpreted. 

 Typical of the opinion of his time, Dobson (1875, p. 348) included all 

 known genera in his "Group Plecoti" which was the equivalent of a 

 subfamily. As late as 1897 Miller (1897, p. 41) employed the name 

 Plecotinae, of subfamily rank, to include the American big-eared 

 vespertilionids Plecotus (subgenus Corynorhinus) and Euderma. For 

 Antrozous he erected a separate subfamily, Antrozoinae. Later 

 Miller (1907, p. 197) abandoned the subfamily Plecotinae and included 

 its genera in the subfamily Vespertilioninae. At the same time he 

 adopted the terminology of Peters (1865) and placed Antrozous in the 

 subfamily Nyctophilinae. 



The large ears and auditory bullae and strong zygomata — the 

 principal characteristics common to the 10 genera and subgenera 

 listed above — may not indicate kinship. The classification of Tate 

 (1941, p. 590; 1942, p. 225), based on other characters, probably 

 better expresses the natural relationships of these genera and sub- 

 genera : 



Subfamily Vespertilioninae 

 Group Myotini 



Genera: Plecotus 



Corynorhinus 



Idionyeteris 



Euderma 



